Computer Science – Sound
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.9439z&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, June 1, 1991, p. 9439-9453. Bartol Research Institute-supported resea
Computer Science
Sound
16
Halley'S Comet, Magnetohydrodynamics, Oblique Shock Waves, Rankine-Hugoniot Relation, Bow Waves, Combustible Flow, Entropy, Stream Functions (Fluids), Supersonic Flow
Scientific paper
Giotto observations of the outbound Halley bow shock cannot be understood in terms of simple hydrodynamic or MHD descriptions. Here, the properties of the Rankine-Hugoniot (R-H) conditions of the outbound Halley bow shock are investigated using a geometric formulation of the entropy condition. A concise theoretical description of hydrodynamic mass-loading shock is obtained and it is shown that mass-loading shocks have more in common with combustion shocks than with ordinary nonreacting gas dynamical shocks. It is shown that, for decelerated solutions to the R-H conditions to exist, the upstream flow speed must be larger than the critical speed which in turn must exceed the speed of sound. It is suggested that the inbound Halley bow shock may involve structures consisting of a sharp decrease in the flow velocity preceding a recovery and an increase in the final downstream flow speed.
Oughton Sean
Zank Gary P.
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